From: Jiri Olsa <jolsa@redhat.com>
To: Wang Nan <wangnan0@huawei.com>
Cc: acme@kernel.org, lizefan@huawei.com,
linux-kernel@vger.kernel.org, pi3orama@163.com,
He Kuang <hekuang@huawei.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Jiri Olsa <jolsa@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Nilay Vaish <nilayvaish@gmail.com>
Subject: Re: [PATCH v16 14/15] perf tools: Don't warn about out of order event if write_backward is used
Date: Fri, 15 Jul 2016 16:59:23 +0200 [thread overview]
Message-ID: <20160715145923.GA29695@krava> (raw)
In-Reply-To: <1468485287-33422-15-git-send-email-wangnan0@huawei.com>
On Thu, Jul 14, 2016 at 08:34:46AM +0000, Wang Nan wrote:
> If write_backward attribute is set, records are written into kernel
> ring buffer from end to beginning, but read from beginning to end.
so IIUIC they are stored from the newest to the oldest one right?
we might want to sort them back when reading the perf.data,
or mark the area in the data section and trat it specially
or just make ordered_events__queue to recognize backward
data and buffer long enough before pushing the sample
to higher level
or any other way that would make sense ;-)
however this might come as follow up update, no reason
to hold this patchset on this
jirka
next prev parent reply other threads:[~2016-07-15 14:59 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-14 8:34 [PATCH v16 00/15] perf tools: Support overwritable ring buffer Wang Nan
2016-07-14 8:34 ` [PATCH v16 01/15] perf tools: Drop redundant evsel->overwrite indicator Wang Nan
2016-07-16 20:45 ` [tip:perf/core] perf evlist: " tip-bot for Arnaldo Carvalho de Melo
2016-07-14 8:34 ` [PATCH v16 02/15] tools lib fd array: Allow associating a pointer cookie with each entry Wang Nan
2016-07-16 20:46 ` [tip:perf/core] " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 03/15] perf tools: Update perf evlist mmap related APIs and helpers Wang Nan
2016-07-16 20:46 ` [tip:perf/core] perf evlist: Update " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 04/15] perf tools: Decouple record__mmap_read() and evlist Wang Nan
2016-07-16 20:47 ` [tip:perf/core] perf record: " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 05/15] perf tools: Record mmap cookie into fdarray private field Wang Nan
2016-07-15 14:59 ` Jiri Olsa
2016-07-16 20:47 ` [tip:perf/core] perf evlist: " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 06/15] perf tools: Extract common code in mmap failure processing Wang Nan
2016-07-16 20:48 ` [tip:perf/core] perf evlist: " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 07/15] perf tools: Introduce backward_mmap array for evlist Wang Nan
2016-07-16 20:48 ` [tip:perf/core] perf evlist: " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 08/15] perf tools: Map backward events to backward_mmap Wang Nan
2016-07-16 20:48 ` [tip:perf/core] perf evlist: " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 09/15] perf tools: Drop evlist->backward Wang Nan
2016-07-16 20:49 ` [tip:perf/core] perf evlist: " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 10/15] perf tools: Setup backward mmap state machine Wang Nan
2016-07-16 20:49 ` [tip:perf/core] perf evlist: " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 11/15] perf record: Read from overwritable ring buffer Wang Nan
2016-07-16 20:50 ` [tip:perf/core] " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 12/15] perf tools: Make perf_evlist__{pause,resume} internal helpers Wang Nan
2016-07-16 20:50 ` [tip:perf/core] perf evlist: Make {pause,resume} " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 13/15] perf tools: Enable overwrite settings Wang Nan
2016-07-16 20:50 ` [tip:perf/core] " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 14/15] perf tools: Don't warn about out of order event if write_backward is used Wang Nan
2016-07-15 14:59 ` Jiri Olsa [this message]
2016-07-16 20:51 ` [tip:perf/core] perf session: " tip-bot for Wang Nan
2016-07-14 8:34 ` [PATCH v16 15/15] perf tools: Add --tail-synthesize option Wang Nan
2016-07-16 20:51 ` [tip:perf/core] perf record: " tip-bot for Wang Nan
2016-07-15 15:00 ` [PATCH v16 00/15] perf tools: Support overwritable ring buffer Jiri Olsa
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